Cartridge-fuse.



E. B. MALLORY. CARTRIDGE FUSE. APPLICATION FILED SEPT. 9, 1912. RENEWBD NOV. 20, 1913.

Patented Apr. 7, 1914.

y in the hollow insulating vbody of the car- Unrran sunrise PATENT onirica.

EDWARD B, 'MALLOBIL OF CHICAGO, ILLINOIS, ASSIGNOR TO EGONIOMYFUSE & MANU'- FACTURING COMPANY, OF NEW YORK, `N. Y., A CORPORATION 0F NEWYORK.

Marianen-FUSE.

Specication of Letters Patent.

Application illed September 9, 1912, Serial No. 719,282. Renewed November 20, 1913. Serial No. 802,134.

To all whom it may concern.'

Be it known that I, EDWARD B. MALLORY, a citizen of the UnitedStates, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Cartridge-Fuses, of which the following is a specification.`

My invention relates to cartridge fuses, and refers particularly to that type of fuse known as the ref illable fuse in which the fusible element may be replaced after it has been melted or burned out.

It is the object of my invention to provide a cartridge fuse in which the contact blades are quickly and easily alined with eachother tridge. J y a It is a further object .of my invention vto construct the various parts so that they are cheap to manufacture, while at thev 4same time the operation of the fuse as a whole is eicient, and the parts maybe quickly adjusted in position when it is desired to replace the fusible element.

A further object is to provide parts of such nature that when a blow-out occurs the escaping gases will be directed toward the contact blades and not toward the clips adapted to receive the`contact blades with consequent injury to such clips and liability to cause fire in the presence of inflammable material.

A furtherobject of my invention consists in providing in the cartridge fuse of my in A current passes through the vention a special form of fusible element which reduces the amount of gases generated great excess of fuse, while the fusible element does not become unduly heated under normal working conditions.

in case of a blow-out when a These and other advantages of my invention will'be more readily understood by reference to the accompanying drawings, whic show a preferred embodiment of my invention, and in`whichl y Figure 1 is a longitudinal section through my improved cartridge fuse; Fig. 2V is a lon'- gitudinal section similar to Fig. 1, but taken at right angles. thereto; Fig. 3 4is a'plan of one of the centering washers used in connecc tion with my fuse; Fig. 4. is a sectional view taken o n the line L1-4= of Fig. 3; Fig. 51s 'a plan of the centering washeradapted to 'cooperate withthe washer Shown 1n and 4; Fig. 6 is a sectional view taken on the line 6-6 of Fig. 5'; Fig, 7 is a sectional Aview taken on theline 7-7 ofFig. 2; Fig. 8 is a plan of the fusible element used in mywartridge fuse; Fig. 9 isa side elevation .of the fusible element shown in Fig.l 8; and,

Fig. 110 is a longitudinal section of -a portion.

of the insulating. body element.

The hollow insulating body element 2O is provided with the threaded ends 21 and with the alining notches 22. Each of the Contact blades 23, as most clearly shown in Fig. 2, has a narrow end portion 24 and a centering aperture'25. Y Passing through the aperture 25 of each contact blade 23 is the tongue 26 of the washer 27, the tongue 26 being formed by cutting the slots 28 in said washer. To the inner surface of the washer 27 is riveted orvotherwise suitably fastened the alining element 29,which is adapted to engage the notches 22 ofthe insulating body 20 when the -tongue 26 of the washer 27 is slipped .through the aperture 25 ofthe 'contact blade 23. After the washer 27 has been lplaced in position, the center-ing tongue 30 of the washer 31 is passed through the aperture 25 of the contact blade 23 from the opposite direction l:from that in which the tongue 26 of the washer 27 is passed through said aperture. In this way theopposite surfaces of the contact `blade are heldhetween the bases of the slots/28. of the washer-"'27 and the bases of'the slots 32 ofthe yvasher 31. The cap 33 is a plied to the threaded end of theinsulating body 20, and. serves to hold the centering washers 27 and 31 'in position. It will be observed that `a slight` annular space 34 is formed between the inside of the cap 33 andthe outer peripheries of the 4washers 27 .and 31.

The fusible element 35 is provided with enlarged ends 36, each of which has an a erhy ture 37 The central ortion 38 ofthe usie proper size to .melt

ble element 35 'is of t l atv the predetermined rating of the fuse. ,It will be evident that-sincethe main portions Patented Apr. 7, 1914.. I

38 o f thefusible elementare of less width v than the enlarged ends 36, whena blow-out occurs, under severe 'cpnditions, the amo/unt of gas generated lwill be reducedv below that which would be generated if the portions @while in a normal blow-out, in which the 38 were.I of the samewidth as the en'ds, 36, l

55 means passing throughthe apertures of' said contact blades, for centering the 'latter in fuse rating, only the restricted portion 38 will be affected. 'llhe ends 36 of the fusible element 35 are attached to the ends of the contact blades 23 by means of the bolts 39 having the nuts d0, the washers il being preferably employed between the ends 37 of the fusible element 36 and the head of the bolt .39 and the nut 40. (Onaccount of the enlarged ends of the fusible element 35 an excellent contact is obtained between the latter and the contact blades23. The insulating body -may be filled With any suitable packing..

' After the-various parts have been placed in position as just described, it will be evident that in case of a blow-out the .gases will hrst pass-through the passages which are formed by the slots 28 in the Washers 27.'

- These gases ynext pass through the annular washers and the 'caps 33 'and finally pass through the slots 32 of the washers 31, andrst mentioned, its cap space 34 between the peripheries of the are thus directed toward the contact blades .2d instead of being directed 'in a line parallel to the contact blades* themselves.` ln this Way the liabilityJ of fire is greatly reduced, since theinammable gases do not pass to nearly as great a distance fromv the ends ofy the cartridge.

After ablow-out each of the caps 33 is removed and the pair of centering washers are next removed from one of the Contact' blades 23. The contact blades `being removed from the insulating .body 20, a new fusible element 35 is attached to said contact blades;` the blade from which the washers! have been removed'is passed through, the insulating body 20 into osition, the ca `for the opposite contact b ade is ap lie the cartridge is lled with'packing, t e centering washersare applied to the contact blade 33 is screwed lonto the end of the insulating body 20, and the cartridge fuse is again ready for use.

lt will be apparent to those skilled in the art that many changes could be made in the 'detail construction of the various parts which' I have described' without departing from the spirit or scope of my,V invention.

blades having apertures therein, a fusible element, means for attaching said fusible element to said contact blades, removable a hollow insulating body, a. pair`of contact blades having apertures therein, a fusible v element, means for attaching said fusible element to said contact blades. a centeringy 1. In a 'cartridge fuse, the combination of, "a hollowr insulating body, a pair of' contact Lineales movable means passing through the aperf tures of said contact yblades and engaging thevends of said insulating body for centering said blades in said insulating body, and

means for holding' said centering means in' position, substantially as described.

4:. lin a rellable'cartridge fuse, the combi'- nation of a hollow insulating body having alining notchesin its ends, a pair of contact blades adapted to enter opposite ends of' said insulating body, each of said blades v having 'an aperture therethrough, and alining and centeringnieans having removable engagement with said contact blades and passing through the apertures in the latter,

said-alining and centering means having portionsV engaging! the alining notches in the ends of said insulating body, substantia'lly as described- 5. ln a rellable cartridge fuse, the combination of a hollow insulating body ,having alining notches in its ends, a air of contact blades 'adapted to enter opposite ends of said insulating body, each of said blades having an aperture therethrough, alining and oentering means having removable engagement fwith said contact` blades and passing .through the apertures in the latter, said alining and centering means having portions i .engaging the alining notches inthe ends of said insulating body, and means for locking p said alining and centering means" in position, substantially as described.

,6. In a reiillable cartridge fuse, the combination of a hollow insulating y, a pair of bontact blades, ing an aperture therethrough, a fusible element, means for removably attaching said each of `said rblades hav# fusible element to lsaid contact blades, a pair of centering washers for eachiof saidcontact blades, each of said Washers having a tongue' adapted to ass through theaperture in said contact blade, said Washers overlying leach,l other, and means:l for removably securing said AWashers to the ends of said insulating body, substantially. as described.

7. l'nfa yreillable cartridge fuse, the comhina-tion of a hollafw insulating body, a contact blade'at eachend of said body, a fusif ble element, means for removably securing said fusible element to said contact blades,

and removable means for alining and centering each, of said contact blades, said alining and .eenteringhneans having gas escape passagesftherein for `directing the gases generated b1 a blow-out in a path substantially at rig t angles to the mam axis of the fuse, substantially' as described.

8. In a cartridge fuse, the combination of a hollow insulating body, a pair of contact blades projecting into the ends of said body, each of said blades having an aperture therein, a fusible element, means for attaching said fusible element to the inner ends of said contact blades, a pair of passing through said aperture, said washers overlymg each other and adapted to be applied to said blade from `opposite directions, and removable means for securing said Washers in osition at the ends of said insulating bo y, substantially as described.

9. Ina cartridge fuse, the combination of slotted center-- ing washers fitted to each of said blades and able means for securing said Washers at a hollow insulating body, apair of contact blades projecting into the ends of said insulating body, each of said blades having an aperture therein, a fusible element, means for attaching said fusible element to the inner ends of said contact blades, a pair of centering washers engv of each'of said contact bla s, said Washers overlying each other and each of said Washers having a projection passing through the aperture of said contact blade, and removends of said insulating body, as described.' v

EDWARD B. MALLORY.

Witnesses:

A. IL. EUSTIGE, HENRY M. HUXLEY.

substantially gini opposite faces 'l the Q0 

